# Dockerfile for WebSocket server only

FROM node:20-alpine

# Set working directory
WORKDIR /app

# Copy package files
COPY package*.json ./

# Install only production dependencies
RUN npm install --omit=dev

# Copy only the websocket server code
COPY src/websocket-server.js ./src/

# Create a non-root user and group with the node user ID
RUN addgroup -g 1001 -S nodejs && \
    adduser -S -u 1001 -G nodejs nodejs

# Switch to non-root user
USER nodejs

# Set environment variables
ENV NODE_ENV=production
ENV WS_PORT=3001

# Start the WebSocket server
CMD ["node", "src/websocket-server.js"]